Phonograph-stop mechanism.



A. H. FRANKE.

PHONOGRAPH STOP MECHANISM.

APPLICATION FILED AUG-30, I918.

1,302,650. Patented May 6, 1919.

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ARTHUR FRANKE, 0F MANITOWOG, WISCONSIN.

PHONOGRAPH-STOP MECHANISM.

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Specification of Letters Patent.

Patented May 6, 1919.

Application filed August 30, 19181 Serial No. 252,101.

and adapted to stop the playing of records of different sizes at theproper times.

It is in general the object of myinventionto simplify and otherwiseimprove the structure and to increase the operative efficiency ofdevices of this character, a more specific object residing in theprovision of a stop mechanism which may be most readily applied tovarious types of phonograph structures now in use.

It is a further and important object of my invention to avoid thenecessity of manipulating the tone arm in this manner to procure settingof the stop mechanism for a predetermined stop, and it is moreparticularly my object in this connectlon to apply a selective settingmeans for the stop mecha .nism which may be operated in conjunctionwith. certain symbols placed on the record denoting the length of timewhlch the record is to be played, such symbols corresponding withsymbols or graduations of the setting means to determine lts operation.

With the above and other objectsand advantages in view myinventionresidesmore particularly in the novel construction; combinationand arrangement ofparts which will be hereinafter. described and pointedoutin the appended claims.

In the accompanying drawings:

Figure 1 is a plan view of a phonograph showing myimproved stopmechanism associated therewith, portions of the turn-table and recordthereon being broken away to show the major portion of my mechanismwhich is disposed thereunder.

Fig. 2 is an enlarged plan view of the setting dial and its casing,aportion of the casingbeing broken away. 1

Referring now more particularly to the accompanying drawings, 5designates the playing base of a phonograph cabinet on which is mountedthe usual turn-table 6 carryinga record disk 7 which isengageableby thediaphragm (not shown) of the usual horizontal swinging; tone arm 8;

My improved stop mechanism includes a base-plate 9 which is secured onthe playing base 5 and which extends under the turntable, having pivotedthereto'under the turntable a brake-lever 10 having an actuating arm 11extending outwardly fromunder the periphery of the turntable, and havingat one side ofthis actuating arm a second arm 12 carrying a frictionblock 13engageable in the conventional manner for braking action withthe inner peripheryof the turn-table wall. At the other side of the arm11, inwardly of said wall, the lever is provided Witha bearing surface14, concentric to the pivotal axis of the lever, and provided with arecess 15 therein. The lever is resiliently urged to clamping. positionby a retractile spring 16 secured thereto at its side remote from thebrake block 13 andsecured to the base plate. Intermediately pivoted tothe base plate also at this side of the brake lever is a second lever 17having one end bent laterally and forming a pawl engage- A able in therecess 15 of the brake lever to hold face19 by passage of the outerportion of the lever throughithe walls of a casing 21 formed on thatportion of the base-plate 9 which projects from the periphery of theturntable 7 Pivoted on the end of the lever adjacent the bearing surface19 of the lever 17is an angular lever 22 having one end engageableagainst the bearingv surface and playing movement permitted the tonearm.

Daiferent records, even of the same general size, have differing lengthsof playing grooves, and for adjustably positioning the lever 22 inaccordance with the different playing lengths of the records, a dial 23is rotatably mounted in the outer portion of the casing on a knob shaft24: which projects from the casing and which carries a conventionallyshown pinion 25 meshing with a ear wheel 26 journaled in the casingunder the dial and meshing in turn with a series of'rack teeth 27 011the lever carrying slide bar 20. The dial carries a series of symbols 28associated preferably with gradua tion marks which are viewed through asight opening 29 in the casing, and these symbols correspond to symbols30 placed on the record disks and denoting the playing lengths of thedisks.

Thus, in the operation of my improved mechanism, the disk 23 is rotatedby the knob shaft 24 to display through the sight opening 29 of thecasing a symbol corresponding to the symbol of the record to be played,and thus rotation of the disk sets the rock lever 22 in proper position.Then, as the playing arm moves inwardly to its desired limit of playingmovement, it engages the lever 22, rocking the lever 17 todraw its pawlend from the recess 15 of the brake lever 10, permitting brakingactuation of said lever by engagement of the brake block 13 with theturn-table while under influence of the spring 16. In this movement ofthe brake lever 10, the pawl end of the lever 17 rides upon the bearingsurfacel l of the brake lever, and consequently when the handle 10 ofthe brake lever is grasped to release the turntable for the playingofanother record, the pawl end of the lever 17 will be automaticallyengaged in the recess 15 of the brake lever to thus reset the stopmechanism, this movement of the lever 17 to resetting position beingprocured by a leaf spring 31 secured to the base-plate and engaging saidlever at its under portion remote f-romits pawl end, it being noted thatthis resetting operation is independent of relative movement of theslide'bar and the pawl 22 carried thereby which may thus be previouslyset for operation at a different inward limit of movement of thetone-arm.

An exceedingly simple and efiicient stop mechanism has thus beenprovided which may be most readily and accurately set in accordance withthe differing playing operations. The symbols 30 of the record disks maybe placed thereon during the manufacture of the disk, or they may beplaced thereon by the user of previously purchased record disks, sincethe proper symbol for eo-action with a corresponding stop mechanismsy1nbol may be most readily determined by placing the tone arm at itsinward desired limit of movement, with the pawl 22 still furtherinwardly, and then rotating the disk 23 to bring the pawl 22 intoengagement with the depending pin 23 of the tone-arm and then noting thesymbol and graduation which appears in the sight opening 29 of thecasing 21. i

It will be further appreciated that other methods of coordinating thesymbols carried by the record disk with certain positions of the rocklever 22 may be provided, and that to meet differing conditions of use,various changes and modifications of structure may be employed withoutdeparting in any manner from the spirit of the invention as defined bythe appended claims.

What is claimed is:

1. A. phonograph stop mechanism including a base member, a brake leverpivoted on the base member, a brake member carried by said lever, meansurging said lever to braking position, a second lever pivoted on thebase member and engageable with the first lever to hold it against theaction of said means, a bearing surface on the second lever, a slidebar, a trip lever carried by said slide bar and engageable with variousportions of the bearing surface of the second lever to move the secondlever upon engagement of said trip lever by a phonograph tonearm, meansfor holding the slide bar against sliding movement, and symbolsassociated with the slide bar for determining positions of the triplever for engagement by the phonograph tone-arm.

The combination with a phonograph structure including a turn tablehaving a pe-- ripheral brake portion and mounted on said base member, ofa lever pivoted on the base member inwardly of the peripheral portion ofthe turn table, a handle carried by'said lever and projecting outwardlyof the turn table periphery, a brake member carried by the lever forengagement with the turn table periphery, a second intermediatelypivoted lever having one end portion engageable with the first lever tohold it against movement and havingan elongated bearing surface on itsother end portion disposed in a plane transverse to the tone-arm, aslide to rock the second lever and release the brake arin movable in aplane substantially parlever. 10 allel t0 the normal plane of saidbearin sur- In testimony that I claim the foregoing I face, a trip leverpivoted on the slide arm have hereunto setn'iy hand at Manitowoc, in andengageble With said bearing surface and the county of Manitovvoc andState of Wishaving a portion projecting outwardly of consin.

the turn table periphery, and a member on the tone-arm engageable Withsaid trip lever ARTHUR H. FRANKE.

Gopies of this patent may be obtained tor five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

